Ambient Weather WS-YG633 Historical Weather Station with Spirit Thermometer and Storm Glass Liquid Barometer This traditional weather station is both a work of art and an instrument at home in any fine study, library, office or upscale restaurant. The rich, wood framed classic weather station measures temperature (in F and C), and liquid barometer. The antique weather station displays an air of quality and accuracy one would expect with a fine, handcrafted weather instrument from Ambient Weather. The concept that 'decreasing atmospheric pressure predicts stormy weather' was postulated by Lucien Vidie -- and it's the basis for a weather prediction device called a storm glass or liquid barometer. When the air pressure is lower than it was at the time the body was sealed, the water level in the spout will rise above the water level in the body and when the air pressure is higher, the level in the spout will drop below the water level in the body. It consists of a glass container with a sealed body, half filled with water.